Does the Bible say that missing the Mass is a mortal sin?

The Catholic Church teaches that missing the Mass is a mortal sin.

Protestants object vehemently to this teaching. They claim that the Catholic Church oversteps its bounds when she requires her members to attend the Mass on pains of mortal sin. Many nominal Catholics, having been convinced of the Protestant argument, have fallen away because of it. But, what does the Bible say?

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